Polycarbonate composition as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of high-molecular compounds, and particularly relates to a polycarbonate composition as well as a preparation method and application thereof. Specifically, the invention discloses a polycarbonate composition, which comprises the following components in parts by weight: 80-98 parts of polycarbonate; 0.1-1 part of a black coloring agent; 0.2 to 1 part of a flame retardant; 0.2 to 0.5 part of an anti-dripping agent; wherein the black coloring agent is a compound of acetylene carbon black and composite black, and the addition amount of the acetylene carbon black in the polycarbonate composition is 0.02-0.15 wt%; the composite black is formed by mixing anthraquinone green and azo red according to the proportion of 1: (1-5). The polycarbonate composition provided by the invention can be used in black products needing laser engraving, and has the effects of high blackness and high contrast before and after marking.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer compounds, and specifically relates to a polycarbonate composition and a preparation method and application thereof. Background Art

[0002] As a high-precision, environmentally friendly and high-efficiency surface marking method, laser processing is gradually replacing traditional surface printing technologies such as screen printing, transfer printing and hot stamping; it has become an important part of modern processing technology.

[0003] Polycarbonate (PC) materials have good transparency, high gloss, and excellent heat resistance. They are used in various fields such as home appliance housings, electronic component housing ports, and consumer electronics. As people's living standards improve, they have higher and higher requirements for product appearance, and the product surface usually needs to be engraved with product logos. In the process of product production, various guide marks need to be laser engraved on the product surface to facilitate identification or traceability of subsequent processes.

[0004] However, the existing polycarbonate materials are easily carbonized and the flame retardants turn yellow when heated, which results in the laser engraving being yellow and not white enough or having poor clarity.

[0005] Patent CN 117700976 A in the prior art is a flame-retardant black laser-engraved PC composite material and a preparation method thereof. The laser engraving effect is improved by adding trisodium phosphate, copper oxide and nickel metal powder to compound the laser engraving agent and the laser engraving colorant. Metals and their oxides affect the recycling and reuse of plastics. At the same time, current environmental protection regulations have requirements on the content of metal nickel, such as Annex 17 of the REACH Regulation, which has provisions on the restriction of the use of nickel metal. Moreover, the patent does not clearly describe the blackness of the material and the contrast after marking.

[0006] Therefore, the prior art lacks a polycarbonate composition that complies with current environmental regulations, can be recycled and reused, has high clarity in laser engraving, and does not turn yellow after laser engraving. Summary of the invention

[0007] The purpose of the present invention is to overcome the above technical defects and provide a polycarbonate composition that complies with current environmental protection laws and regulations, can be recycled, and is clear and does not turn yellow after laser engraving.

[0008] Another object of the present invention is to provide a process for preparing the polycarbonate composition.

[0009] Another object of the present invention is to provide applications of the polycarbonate composition.

[0010] The present invention is achieved through the following technical solutions: A polycarbonate composition, comprising the following components in parts by weight: Polycarbonate 80-98 parts; Black colorant: 0.1 - 1 part; Flame retardant: 0.2 - 1 part; Drip - resistant agent: 0.2 - 0.5 part; Among them, the black colorant is a compound of acetylene black and composite black; The addition amount of the acetylene black in the polycarbonate composition is 0.02 - 0.15 wt%; The composite black is composed of anthraquinone green and azo red mixed in a ratio of 1:(1 - 5).

[0011] In the present invention, adding an appropriate amount of acetylene black can improve laser absorption, promote the foaming of the material, so that the black material shows a white effect after laser treatment. Blending the composite black in the black colorant can achieve high blackness. The dyes used in the composite black do not absorb infrared laser, which can effectively avoid the carbonization and yellowing of the PC material caused by excessive energy absorption.

[0012] In the present invention, the anthraquinone green is: 1,4 - bis(p - toluidino)anthraquinone, CAS: 128 - 80 - 3, and its structure is as follows:

[0013]

[0014] In the present invention, the azo red is: methyl 4 - cyano - 5 - [[5 - cyano - 2,6 - bis[(3 - methoxypropyl)amino]-4 - methyl - 3 - pyridyl]azo]-3 - methyl - 2 - thiophenecarboxylate, CAS: 72968 - 71 - 9, and its structure is as follows:

[0015]

[0016] Preferably, the melt flow rate of the polycarbonate is 5 - 25 g / 10 min, and the test conditions are 300 °C and 1.2 kg.

[0017] Preferably, the mass ratio of the carbon black to the composite black is 1:(1 - 30).

[0018] More preferably, the mass ratio of the carbon black to the composite black is 1:(1 - 10).

[0019] Even more preferably, the mass ratio of the carbon black to the composite black is 1:(5 - 10).

[0020] Preferably, the specific surface area of the acetylene black is 50 - 200 m 2 / g.

[0021] Preferably, the flame retardant is at least one of silicone flame retardants, sulfonate flame retardants, brominated flame retardants, and phosphate esters.

[0022] Further preferably, the flame retardant is a compound of a sulfonate flame retardant and a silicone flame retardant.

[0023] Adding a small amount of the above two types of flame retardants can achieve the V0 flame retardant effect, and at the same time does not affect the transparency of the material, so that the material is easier to color and easier to achieve a high blackness effect.

[0024] Even more preferably, the flame retardant is a compound of a sulfonate flame retardant and a silicone flame retardant in a mass ratio of 1:(3 - 6).

[0025] Preferably, the anti - dripping agent is selected from polytetrafluoroethylene anti - dripping agents.

[0026] Those skilled in the art can add 0.01 - 3 parts by weight of additives according to actual needs.

[0027] Preferably, the additive is selected from at least one of antioxidants or lubricants.

[0028] Further preferably, the antioxidant is selected from at least one of hindered phenol antioxidants, hindered amine antioxidants or phosphite antioxidants.

[0029] Further preferably, the lubricant is selected from at least one of polyol ester lubricants, ethylene bisstearamide, dimethyl silicone oil or stearic acid amide.

[0030] The present invention provides a method for preparing the above - mentioned polycarbonate composition, which includes the following steps: Mix the dried polycarbonate and other components evenly according to the ratio, then add them to a twin - screw extruder. After the extruded strip is cooled, it is pelletized to obtain the polycarbonate composition.

[0031] Preferably, the temperature of melt blending is 200 - 280 °C, and the rotational speed of the twin - screw is 300 - 500 revolutions per minute.

[0032] The present invention also provides the application of the above - mentioned polycarbonate composition for preparing products that need laser engraving.

[0033] The present invention has the following beneficial effects compared with the prior art: In the black polycarbonate composition provided by the present invention, acetylene black and aniline black are compounded as a black colorant. Without adding laser engraving additives, it can effectively improve the blackness of the material and has excellent laser marking performance. Specific embodiments

[0034] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0035] Sources of raw materials used in the present invention and related performance parameters:

[0036] Various test methods: The high-blackness, easy-to-mark, laser-markable, flame-retardant PC materials of the embodiments and comparative examples of the present invention are made into color plates with a size of 83 mm*54 mm*2 mm and smooth surfaces on both sides.

[0037] (1) Blackness test: Use Datacolor 1050 colorimeter to measure the L value of the color plate under SCI mode D65 light source. The lower the L value, the better the blackness of the material.

[0038] (2) Color difference before and after: The color plate was marked with a Han's Laser EP12 infrared marking machine, with a red light wavelength of 1064nm and a marking process of 75KHz frequency and 17.5A current. The Datacolor 1050 colorimeter was used to measure the L / A / B values ​​of the color plate before and after marking in SCI mode D65 light source, and the color difference before and after marking was calculated according to the CIE 1976 color difference formula. The larger the color difference value, the better the laser marking performance.

[0039] (3) Flame retardant performance: According to ANSI / UL 94-2018, the sample size is 125*13*3mm.

[0040] Table 1 Weight parts of each component of the polycarbonate composition of Examples 1-12 and test results

[0041] It can be seen from Examples 1 to 12 that the polycarbonate composition provided by the present invention has an L value lower than 28, and the color difference before and after marking is greater than 40, and the marking effect is excellent.

[0042] It can be seen from Examples 2-3 and 5-7 that as the amount of acetylene black added increases, the color difference value L before and after marking will gradually increase.

[0043] It can be seen from Examples 8-9 that when the mass ratio of carbon black to composite black is 1:(1-10), the color difference value L before and after marking is higher, and the material marking effect is better.

[0044] Table 2 Weight parts of each component of the polycarbonate composition of Comparative Examples 1-5 and test results

[0045] As can be seen from Comparative Example 1, when the carbon black addition amount is too high, the marking effect will decline.

[0046] As can be seen from Comparative Example 2, for the polycarbonate composition without the addition of composite black, the L value is on the high side, it does not have high blackness, and the color difference before and after marking decreases, resulting in a decline in the marking effect.

[0047] As can be seen from Comparative Example 3, the absence of acetylene carbon black will cause a significant decline in the color difference value before and after marking, and the marking effect will drop significantly.

[0048] As can be seen from Comparative Example 4, using oil black to replace carbon black will also cause a significant decline in the color difference value before and after marking, and the marking effect will drop significantly.

[0049] As can be seen from Comparative Example 5, when using composite black 2 containing phthalocyanine green to replace composite black 1 containing anthraquinone green, the L value of the prepared polycarbonate composition is on the high side, and at the same time, the marking effect drops significantly.

Claims

1. A polycarbonate composition, characterized in that By weight, it includes the following components: Polycarbonate 80-98 parts; Black colorant 0.1-1 part; Flame retardant 0.2-1 part; Anti-dripping agent 0.2-0.5 parts; Among them, the black colorant is a compound of acetylene carbon black and composite black; The acetylene black is added in an amount of 0.02-0.15 wt % in the polycarbonate composition; The composite black is prepared by mixing anthraquinone green and azo red in a ratio of 1: (1-5).

2. The polycarbonate composition according to claim 1, characterized in that The melt flow rate of the polycarbonate is 5-25 g / 10 min, and the test conditions are 300° C. and 1.2 kg.

3. The polycarbonate composition according to claim 1, characterized in that The mass ratio of the acetylene black to the composite black is 1:(1-30), preferably 1:(1-10).

4. The polycarbonate composition according to claim 1, characterized in that The flame retardant is at least one of an organic silicon flame retardant, a sulfonate flame retardant, a bromine flame retardant, and a phosphate ester.

5. The polycarbonate composition according to claim 4, characterized in that The flame retardant is selected from a combination of a sulfonate flame retardant and an organosilicon flame retardant.

6. The polycarbonate composition according to claim 5, characterized in that The flame retardant is a compound of a sulfonate flame retardant and an organosilicon flame retardant in a mass ratio of 1:(3-6).

7. The polycarbonate composition according to claim 1, characterized in that The anti-drip agent is selected from polytetrafluoroethylene anti-drip agent.

8. The polycarbonate composition according to claim 1, characterized in that By weight, it also includes 0.01-3 parts of auxiliary agents, preferably the auxiliary agent is selected from at least one of antioxidants or lubricants, preferably the antioxidant is selected from at least one of hindered phenol antioxidants, hindered amine antioxidants or phosphite antioxidants, and preferably the lubricant is selected from polyol ester lubricants.

9. The method for preparing a polycarbonate composition according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: uniformly mixing the dried polycarbonate with other components according to a proportion, adding the mixture into a twin-screw extruder, cooling the extruded material strips and then pelletizing them to obtain a polycarbonate composition.

10. Use of the polycarbonate composition according to any one of claims 1 to 8, characterized in that Used to prepare products that require laser engraving.

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